FDI2056 Use
r’s Manual
v 2.0 r 1.1
– 03/13
Copyright © 2013 Metrolab Technology SA
74
www.metrolab.com
0101 : Bi-Phase Pulses positive direction
0110 : Bi-Phase Pulses negative direction
0111 : Bi-Phase Pulses
1000 : Bi-Phase Target
Bits 27..16
Trigger prescaler.
Bits 15..0
Triggers count
A value of 0 will be interpreted as infinite count.
The trigger configuration uses a 16-Words fifo. Once the acquisition is started, the first line of the
FIFO is used to select and count the trigger events as configured by the user. As soon as the
programmed count in the line is exhausted, the system automatically tries to read a new line. The
acquisition will be marked as completed once no more line is available. Since the fifo can be monitored
at any time by reading the bit 2 of the Status register, it is possible for the user to add a new trigger
configuration line each time a line count is exhausted, letting an infinite number of configuration possible.
Status Register (BAR3 : 0x100)
Bit 0
Acquisition complete
The acquisition is complete, the Trigger FIFO having been
exhausted.
Bit 1
Data FIFO Event
The detailed condition which generated this event is
availa
ble in the “FIFO status” register, bits 0 to 3.
Bit 2
Trigger FIFO Event
The detailed condition which generated this event is
available in the
“FIFO status” register, bits 4 and 5.
Bit 3
Calculation Overflow
The detailed condition which generated this event is
available in the “Data processing reported events” register.
Bit 4
Trigger Overrun
More than one trigger event was detected between two data
acquisitions.
Bit 5
System error
ADC or Encoder error. More details on the reasons which
generated this event are available in the “Acquisition
processing reported events” register.
Mode (BAR3 : 0x101)
Bit 0
Enable acquisition
Enable the acquisition process.
Bit 1
Enable trigger
Enable the triggering system.
Bit 2
Enable internal time
trigger
Enable the internal time trigger to operate.
Bit 3
unused
Bit 4
Float64 results
1 => Results are Float64, 0 => Results are Float32
Bit 5
Sampler
1 => Sampler, 0 => Integrator
Bit 6
Mean
1 => Mean is measured for 2^20 samples.
Bit 7
Loopback
For memory diagnostic purpose. Data written to BAR2 may
be read back on the same access port.